Random flickers of taskbar/loading circle

I never had this problem until recently. I was using Jarvis for a long time, and then seemingly out of nowhere, I started having this problem.

In the Kodi menu, or during video playback, I will get random quick flashes of the Windows taskbar at the bottom of the screen and/or the small “busy” circle in the center of the screen.

I updated to Krypton 5 and had the same problem. Tried a clean install with none of my addons etc, same problem.

Used task manager to kill absolutely every process I could, same problem.

Fullscreen window or real fullscreen, same problem.

This does not happen in any other application, or in games, it seems to be entirely limited to Kodi.

Windows 10, currently Kodi Krypton beta 5, running in portable mode (always have).

I’ll put up a log as soon as I get back to that computer.

Any ideas?